upgrade codecs was missing the service action upgrade logic.
Merge pull request #291 from continuuity/feature/cleanup-codecs

upgrade codecs was missing the service action upgrade logic.
Added: Node store service
Added: Node store views
Added: Tests for get node
Added: Tests for delete node
Added: Function to write multiple nodes.
Added: Node exists in node store
Added: Node set and insert to node store
Added: Tests for deleting node as user and admin
Added: Tests for testing update node in store